490 ALCYONIDIID/E. 



Group a. HALCTONELLEA, Ehrcnbcrg. 



ALCYONIDUL.E, Johnston, Brit, Zooph. ed. 1. 

 POLTZOA CARNOSA, Gray. 



ZQARIUM feshy or membranous. ZOCECIA developed by bud- 

 ding from other zooecia, and not from the internodes 

 of a stolon. 



Family I. Alcyonidiidae. 



ALCYONIDULE, Couch. 

 HALCTONELLEA, Smitt. 



ZOCECIA more or less closely united, immersed in an expanded 

 and adherent gelatinous crust, or forming an erect cylin- 

 drical or compressed zoarium ; orifice closed by the mere 

 invagination of the tentacular sheath ; not protected by 

 external labia. 



Genus ALCYONIDIUM, Lamouroux. 



Der. From Alcyonium, a genus of Actinozoa, to which the present was 

 supposed to bear some resemblance. 



ALCYONIDIUM, Lamx. Exposit. Method. (1821) : Johnston : Couch : &c. 

 ALCYONIUM (part.), Linnaeus : Pallas: Miiller: Fleming: &c. 

 HALODACTYLUS, Far re (1837) : Van Beneden. 

 CYCLODM (sp.), Hassall. 

 SARCOCIUTUM (sp.), Hassall. 



GENERIC CHARACTER. ZCXECIA immersed or subim- 

 mersed ; the orifice simple, papill<eform. ZOARIUM gelati- 

 nous or argillaceous, either crustaceous or erect. 



